...but it's OK to pick on the poor, misunderstood grapenut?? ;-) (Sorry,
could not resist that one)

On a more serious note, now that you've brought up Christian Scientists, I
have difficulty coming up with a terse description of
"scientists-who-are-Christian." The most obvious term would, of course, be
"Christian scientists" but that term has been allocated to a sect already
(and let's not get into the details of "sect" and "cult" here).

The reason for my question is that I teach an introductory science course at
a Christian college and often refer to scientists who are Christian.